No garage accessory to a dwelling (other than a multiple dwelling) shall be greater than 864 square feet, with a maximum height of 17 feet. The accessory garage shall hold no more than three motor vehicles, one of which may be a commercial passenger vehicle owned and used by the occupant of the main building, who may also permit not more than two private passenger vehicles owned by other persons to be stored in such accessory garage. Garages accessory to multiple dwellings and other main buildings (except single-story detached dwellings) may have such capacity for the storage of motor vehicles as may be authorized by the Planning Board with due regard to the nature of the main building, the reasonable need for accessory garage facilities and the space available for the location of an accessory garage on the lot in conformity with the requirements of this chapter. Notwithstanding the foregoing, temporary carports, car tents, vehicle canopies, portable garages and other similar structures used for storage are expressly prohibited, regardless of size or construction materials and period of use. For the purpose of this section, temporary carports, car tents, vehicle canopies, portable garages, and structures used for storage are any roofed structure, as defined by the Municipal Land Use Law, whether supported with metal, aluminum, wooden, plastic or steel construction, and regardless of the nature or composition of the cover material, providing space for the parking of a motor vehicle(s), and/or storage of goods and household items, whether or not enclosed, which is not constructed or designed to be permanent in nature.